Sounds like HDZs can provide a lot more than the 18 lbf of the stock Z axis! You’re lucky the router wasn’t running at the time! I, and likely many others, have broken both Z and X axis V-wheels on stock Z axis Shapeokos when crashing running routers.
Has anyone out there broken V-wheels when the spindle wasn’t running?
2020-01-03 Update: This issue was discussed in depth in an earlier thread. The question wasn’t answered though. 
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